Compound stuffing-box for rods, stems, and shafts.



0. 0. THWING. COMPOUND STUFFING BOX FOR RODS, STEMS, AND SHAFTS.

APPLICATION FILED MAY 9, i908.

Patented Jan. 12, 1909 1 1 NESSES A flow/1111' UNITE STiiTiTE Pit-Th3()FFICE.

ORRELL O. THWING, OF FORT WAYNE, INDIANA.

oorifeonnn cements-non nonncns, s'rnius, AND sn-an'rs.

Sp ecification. 0i Letters'Patent.

Patented. Jan. 12, 1909.-

Application died May 9, 1903. fierial Ito. 431,915.

To all whom it may concern:

Be it known that l, ORRELL 0. Tnwnvc, a citizen of the United States,residing at Fort Wayne, in the county of Allen and State of Indiana,have invented certain new and usepassages for the stems of such valves,or for' the rods or shafts of engines, pum s or compressors', topreventthe escape-of uid under pressure.

In the distribution of gas at a pressure of one pound to the square inchand over, much diificulty has been experienced, owing to the fact thatin a short time the stufiing box, which is intended to prevent leakageat the point where the valve stem enters the valve cap, fails toproperly perform'its dutyand in conse uence a considerable leakage,varying accor ing to the amount of pressure carried,

occurs, causing not only an appreciable loss of gas, but also annoyanceand danger from the gas which thereby escapes.

It is the object of-this invention to prevent the above mentioned csca eof gas, and conse uent loss, danger an discomfort from valves to whichit is applied, and to prevent the escape of any fluid or substancethrough stufiing boxes subjected to any pressure in connection with rodsand stems, whether used for-valves, engines, compressors, or any purposewhatever.

The matter constituting my invention will be defined in the claims.

For a detailed description of my invention reference is had to theaccompanying drawings, in which- Figure 1 represents a vertical sectionof my seal chamber as made for new valves in the course of construction.Fig. 2 represents a vertical section of the. same, modified for a'plication to the caps of old valves.

l ave illustrated my invention; which may be termed a seal-chamber, asapplied to the casing 'and-stemof a gate valve, but I wish it understoodthat the principal features v of construction may be applied to theoperating stems and rods of ot or devices or apparatus where tightjoints are required to prevent leakage of fluid at the openingthroughwhich the rod, shaft or stem operates.

The cap '1 of the valve casing is provided at-the top'with the usualopening and recess 2 for the valve'stem 4 and its fixed collar 4, and tothe u per endof the valve stem is socured a hen -wheel 5. Inconstructing new valves the cap is provided with'a wide sup"- portingfiange'3 as shown in Fig. 1 for attachment of my seal chamber orcompound stuitmg boxes. In this construction the interiorstufiing box 6,having afiange 7,'is secured by screw bolts to flange 3 and .is rovidedwith a screw follower 8. This ifius trates' only one of the well-knownstuffing boxes which may be used in this location.

The stufiing box serves as a cover and bear ing for the fixed collar 4*to prevent endwise movement of the valve stem.

The seal-chamber 9-is made with a lower- 0 en end provided with flangesby means of vided with an exterior stuffing box'lO around the valve stem4, also .with an inwardly extending annular boss or projection 11adapted to project into a filling compound and form above the samea'press'ure pocket or The wall of chamber 9 is ro-.

chamber 12 which is completely isolated inlet 15 which is threaded toreceive an external closing plug 16 and an interior short pipe. 17provided with a check valve 18. v The wall at the top of the pressurechamberIZ can be provided if desired width a tapped opening in which issecured a plug or stop cock 19.

In the modification shown inv Fig. '2 the present form of cap 1,constructed for receiving the usual single stufling box, is providedwith an especially constructed .stufiing box 6 having an extended flangeor base 7 for supporting the seal-chamber 9. This extended flange orbase is bolted to the top of the ca and to the flange of chamber 9. Thesea chamber or compound stutfing box is otherwise constructed as abovedescribed] 7 In applyin 'my seal-chamber to a casing and stem or rod theinterior stuffing box 6 will be packed with any suitable packingmaterial and the follower tightened. and adjusted in amanner welblmownto those skilled in the art. When first setting up the device theinternal stuffing box may be packed or adjusted before attaching clamber to the; "flange 3 or T, but atter. the device has been vice,thereby compressing the contained air into the pocket or pressurechamber 12 and sealing the lower end of the tubular boss 11. The amountof such compression will be proportional to the pressure desired on thefilling compound 2 0, such pressure being sufiicient to prevent theescape or leakage of compressed gas or other fiuid contained in orpassing through the valve chamber or casing of other apparatus. It thepressure thus obtained should be insuthcient and in consewhich it isintended to hold.

uence any gas or other fluid should escape t rough the internal stuffingbox, the'tend one ofthe escaping fluid would be to, acoumu' ate in thepocket or pressure chamber 12, thereby increasing the pressure on thefilling compound until it is'suthcient to prevent the escape of thefiuid through the interior stuffing box. At the same time, this pressurewill serve in causing the filling compound to move along the rod or stemto the packing r aterial 1n both stuffing boxes, lubricating I axismaterial and assisting to preserve it and render it impervious to the orother fluid A. tapped open ing rovided with a plug or stop cock 19 canbe p aced in the top of the pocket or pressure chamber for the purposeof allowing the laccumulated gas or other fiuid to escapewhen it isdesired to open up the main chamber for purposes of inspection or forthe purpose of.

re acking or adjusting the stufiing boxes.

y leaving the external stufiing box un-' packed while the fillingcompound is being ischarged into the main chamber, it will be possibleto determine by observation when the fillin compound has passed thelower end of tie annular boss or projection 11 which serves to isolatethe pressure chamber from the rod, by reason of the fact that when thefilling compound passes the bottom of this boss or projection, it willbe forced by the pressure produced in the pressure chamher up into theopening through which the rod or stem passes and will appear in the external stuffing box 10. Other means of observinq the level of thefilling compound in the chamber can be used such as a gage glass or anopening through the side of the chamber which can be closed by means ofa plug or cook, but I believe-that the manner of ascertail-iing theamount of compound, as outlined above, is suflicient and it is desir-'able that as few projecting parts as possible be attached to the chamberin order to revent possible trouble on account of theirbeing broken orbecoming out of order.

Iaving described my invention, What I claim, and desire to secure byLetters Patout, is:

1. The combinationwith a casing and an operating rodpassing through thesame, of a stnfing box around the rod, 2. closed 85 chamber inclosingthe same, containing a fluid or semi-fluid filling and having anisolated pressure pocket or chamber for receiv ing gaseous fluid Underpressure, and a stuffing box located upon the chamber, at the pointwhere the rod or stem enters the chamber, for the purpose ofpreventingany esca e of the fluid or semi-fluid filling, substantial y asdescribed.

2. The combination with a casing and an operating rod passing throughthe same, of a stuffing box around the rod, a closed chamber inclosingthe same, a fluid or semifluid filling contained in the closed chamber,a pressure poclret above the filling andmeans tor isolatmg it fromtherod, su bstantlally as described.

3. The combination with a casing and an operating rod passing throughthe same, of a stuffing box around the rod, a closed chamber inclosingthe same, a fiuid or semifluid filling contained in the closed chamber,a pressure pocket above the filling and means for isolating it from theopening for the rod in the wall of said chamber, substantially asdescribed.

4:. The combination with a casing and an operating rod passing throughthe same, of a stufling box around the rod, a closed sealchamberinclosing said stuffing box and having an inwardly projecting annularboss around the rod, and filling material in the closed chamber sealingthe inner end of said boss and forming an isolated compression pocket orchamber, substantially as described.

5. he combination with a casing and operating rod passing through thesame, of a seal-chamber secured to the casing around the rod, an inletpipe having a check valve, opening into the chamber for admitting afiuid orsemiiluid filling under pressure, substantially as described.

6. The combination with a casing and operating rod passing through thesame, of a seal-chambel secured to the casing around l In testimonywhereof I affix mylsignag ture the rod and having an inwardlyCinojeeting in presence. of two Witnesses. annular boss around the rodananv inlet O O THWING pipe, having a check valve, opening into the 5chamber for admitting-a fluld or semifiuid Witnesses:

filling under pressure, substantially as de- F. V..CROSBY, scribed. R.T. SPEER.

